Engineering Materials
The charge of the blast furnace consists of

Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
Calcined ore, coke and limestone all in equal parts
Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

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Engineering Materials
Free carbon in iron makes the metal

Soft and gives a coarse grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure
Hard and gives a fine grained crystalline structure

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Engineering Materials
Specify the sequence correctly

Stress relief, grain growth, recrystallization
Grain growth, recrystallization, stress relief
Stress relief, recrystallization, grain growth
Grain growth, stress relief, recrystallization

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Engineering Materials
Points of arrest for iron correspond to

Stages at which allotropic forms change
Stages at which further heating does not increase temperature for some time
There is nothing like points of arrest
Stages at which properties do not change with increase in temperature

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